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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '54b845e68c3d3cf664501b381af44023157d53913066dc2b1122773d8885a7fb' 
  AND token = 'cWtMNstlpp3XZ3xKz6wNovETf0bWQJIBVZHsjZTPdMs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}